Power Electronics Lecture (7) Prof. Mohammed Zeki Khedher Department of Electrical Engineering University of Jordan 1.

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Power Electronics Lecture (7) Prof. Mohammed Zeki Khedher Department of Electrical Engineering University of Jordan 1

Single-Phase Full-Wave Diode Rectifier Center-Tap Diode Rectifier

PIV of each diode = Example 3. The rectifier in Fig.2.8 has a purely resistive load of R Determine (a) The efficiency, (b) Form factor (c) Ripple factor (d) TUF (e) Peak inverse voltage (PIV) of diode D1 and(f) Crest factor of transformer secondary current.

The PIV is

Single-Phase Full Bridge Diode Rectifier With Resistive Load

Example 4 single-phase diode bridge rectfier has a purely resistive load of R=15 ohms and, VS=300 sin 314 t and unity transformer ratio. Determine (a) The efficiency, (b) Form factor, (c) Ripple factor, (d) The peak inverse voltage, (PIV) of each diode,, and, (e) Input power factor. The PIV=300V Input power factor =

Comparision between Single Phase Rectifiers Half wave Full wave Fullwave center-tap bridge Peak repetitive reverse voltage VRRM 3.14Vdc 3.14 Vdc 1.57 Vdc Rms input voltage per transformer leg Vs 2.22 Vdc 1.11 Vdc 1.11 Vdc Diode average current IF.AV Idc 0.50 Idc 0.50 Idc Diode rms current IF.RMS Idc Idc Idc Form factor of diode current IF.RMS Rectification ratio Form factor Ripple factor Transformer rating primary VA 2.69 Pdc 1.23 Pdc 1.23 Pdc Transformer rating secondary VA 3.49 Pdc 1.75 Pdc 1.23 Pdc Output ripple frequency fr 1 fi 2 fi 2 fi

Multi-phase Rectifier

Three-Phase Half Wave Rectifier

ThePIV of the diodes is Example A 3-phase star rectifier is operated from 460 V 50 Hz supply at secondary side and the load  resistance is R=20. If the source inductance is negligible, determine (a) Rectification efficiency, (b) Form factor (c) Ripple factor (d) Peak inverse voltage (PIV) of each diode.

The PIV= V m =650.54V

Three-Phase Full Wave Rectifier With Resistive Load

Example 10 The 3-phase bridge rectifier is operated from 460 V 50 Hz supply and the load resistance is R=20ohms. If the source inductance is negligible, determine (a) The efficiency, (b) Form factor (c) Ripple factor (d) Peak inverse voltage (PIV) of each diode.

The PIV= V m =650.54V

Single phase rectifier 3 phase rectifier Performance:

3-phase bridge rectifier with RL load

Condition for continuous load current